He teaches ill, who teaches all

Possible interpretation:The unusual structure of this proverb may make it difficult to understand. It becomes easier if we change the structure to "He who teaches all teaches ill." The word "ill" here means "badly". So it means that the teacher who teaches students everything, does not teach well. A good teacher lets students discover some things for themselves.

Note:ill (adverb) = badly

Quick Quiz:

According to the saying "he teaches ill, who teaches all", a good teacher